Bascttle-biud



S. MOREELL.

BASCULE BRIDGE. APPLICATION FILED Me. a. 19:7. RENEWED 1UNE13. 1919.

Patented July 29, 1919.

2 SHEAETSSHEEYT 1.

.S. MOREELLk BASCULE uinea. APPLICATION FILED DEC. 3, I917; RENEWED JUNE 13. 191?.

rammed Jmy29, 1919 2 SHEETS-SHEET 21' saucer. iroanunn, onofircaeo rumors.

' BASCULEPRIDGE.

Specification of Letters Patent.

Patented July 29, 191.9.

Application filed December 3, 1917, Serial No. 205,202. Renewed June 18, 1919. Serial No. 304,093-

To all whomzt'may concern I Be it known that I, SAMUEL Montana, a

citizen of the United States, residing at Chicago, inthecounty of Cook and State of provements in Bascule-Bridges, of which the Illinois, have invented new and useful Imfollowing is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification. a

My invention relates to improvements in bascule bridges ofthe type in which counterweights are rovided for balancing the weight of the ridge spans.

One of the main objects of my invention is the provision of means for supporting the inner ends. of bridge trunnions of suchdesign and construction as to permit counterweights carried at the rear of the bridge spans to swing into a space directly below said trunnions during the operation ofppening the bridge. i

' A further object is the provision of trunnion supporting means, the base of which is substantially vertically under the inner-ends of the trunnions to be supported, utilizing a truss structure.

A further object is th rovision of means whereby the point of app ication of the nltimate load may be shifted or made'to occupy different positions with res to'the vertical' line passing through t e trunnion and liability of excessive lifting straln-on the supporting masonry avoide p a A further object is the utilization of a ubracing system. for preventing vibrat on during movement and for taking wind stresses in both frame and mov1ng f; These and such other ob]ects as ma hereinafter appear are attained 111 my device, embodiments of which are illus tra m the accompanying drawings, in wh1ch.---'.

Figure 1 represents a tion taken through the bridge online ,1--1 of Fig. 2, showing the relative posit ons of the counterweights and columns when the brid e is opened and indicating by dotted lines t e closed position of the bridge. Fig. 2 is a vertical transverse section of the bridge taken on line 2- 2 of Fig. 1.

Fig. 3 is a detail plan section taken on line 33 of Fig. 1, showing clearance means em-. p10 ed in a counterweight. ig. 4 is a side elevation showing a modified form of truss-work for the trunnion S PP longitudinal secillustration.

The form of construction as illustrated in the drawings comprises bridge trusses 1 of, conventional desi n and orovided withtrum nlons 2 which project inwardly and out so wardly from the 'lanes of the-trusses as shown in Fig. 2. he trunnions 2 are'arran (1 in axial alinement and the outer ends thereof, which are outside of the line of the bridge structure, are supported by columns 3 partiallyembedded in masonrg i forming the side walls of thepit. This inasonry is preferably of concrete but lithe suitable materials-may be employed such granite brick, etc. A roadwa 1 6 s ported by means of cross 'rders 7 w i l; are tend. from one truss to t e other, struction bein clear by reference p The usual raclg and pinion employed. operating bridges of this character are emitted in the drawings for the sake ,of clearness of bridge counterweight 8 shown as a blovlcpf reinforced concrete is arranged at thegrea'r of trusses Land extends from one truss to the other, there being cross girders? ca ied by said-trusses which closely em brake and support said counterweight.

Shdnldered promotions 10 extend fromthe rea'g ends of trusses 1 for engagin a girderlfii} 10' "for:supportingl the bridge in tie normal closed position t ereof, said girder-being suitably anchored by connection with the rearpit wall 11, as shown in Fig. 1. F From Fig. 3 it will be seen that the path of movement of the ends of counterweight 8 extends to and beyond a perpendicular dropped from the inner end 01% trunnions 2, conse quently suitable clearance must be provided in the inside trunnion supporting columns 1%. at This clearance is obtained providing an offset for said column, as shown in Fig. l.

The offset portion is rigidly trusses? in order that the strength nfeachcolumnshall not be impaired. The...truss--wcrk comprises a P5P;

g and 15 are rigidly braced by means ofmembers 16, l7azand 18, which form a rigid therein are reinforced against lateral stresses construction.

'- The columns 12 above the truss-worlr by means of struts 19 which extend to the pit front wall 20, as shown in Figs. 2 and g and against longitudinal pressure by the brace 5. Side struts 21 are also provided to reinforce the outside-columns 3 against wind stresses, as shown in F ig. 2; The upper ends of inside trunnion supporting columns 12 are connected lay-means of a horizontally extending laced member 22 which is thoroughly gusseted at the ends thereof with said columns for forming a substantial reinforcement. The member 22 in single decked bridges forms a-support for the fixed portion of the roadway (i In double decked brid 'es this will act simply as a lateral strut for tile inside frame.

From Fig. 2 it will be observed that the bases of columns 3 and 12 are supported by sub-piers 23', but it is understood that any suitable foundation may be provided for this purpose. It will be seen that in order to provide clearance for the braces 16 notches 2-2 are formed in the counterweight 8 as shown in Fig. 3.

The modified form of truss-Work for reinforcing columns 12 shown in Fig. :lcomprises members 13, 14: and 15 as in the preferred form, but the braces are somewhat changed in arrangement. Other forms of trusses may be employed, and even a solid yr ebbed construction would serve the purprise. This form is difierent from the preferred form in that the column base is offset slightly from a perpendicular dropped from the center of trunnion. The advantage resulting from this change is that the secondary stresses are sue-has to relieve vertical pressure on front wall 20, since vertical deformation of the column might cause an" undesirable vertical load on the front wall 20. I

By the use of my improved invention, the problem of vibration during motion and the wind stresses are taken care of. It is also possible in light bridges to use a plate girder construction for an inside support and an economic design of moving truss is possible in using my frame.

I can use my invention with any type of foundation, sub-pier, pile or cross girder in the floor of'the pit. I may also have the frame come into the truss laterally eliminating the cross girder but using a cant-a: liver support.

By the-l use of my frame the reaction of the river pier can be regulated to any desired extent by changing the position of the other bearing point. that is with respect to the position of the vertical through the trunnion as shown in Fim l. The point of supsaid truss structure and that in order to attain this end it is simply necessary to prop? erly locate the bearing points of the truss structure relative to the vertical line through the load acting upon the same.

It is evident that the truss construction shown 'in Fig. 4 may be inserted laterally at any desired angle and present a support for both bearings of any given trunnion.

\Vhile I have illustrated and. described the preferred forms of construction for carrying my invention into effect, there might be variations and modifications without departing from the spirit of the invention. I, therefore, do not wish to be limited to the 'precise'details of construction set forth but desire to avail myself of such variations and n'iodifications as come within the scope of the appended claims. 1

Having thus described my invention, what iI claim as new and desire to secure by Letters Patent is:

1. A bascule bridgeflcomprising movable trusses, a counterweight therefor, tr'unnions on which the structure turns, inside column supports for said trunnions, and supporting truss construction for said inside columns having an opening within which said counterweight may pass when it swings below said trunnions.

2. In a .bascule bridge provided with movable trusses, a counterweight, the combination of trunnions for said trusses, a'cantaliver structure supporting said trunnions, said structure being cantalivei'ed to permit the free swing of the counterweight when the bridge in open position.

3. In a bascule bridge provided with movable trusses, a counterweight, the combination of the trunnions for said'trusses, a construction supporting the ends of said trunnions. said constructionhaving a canta'livcred base and a cantalivered top, said construction being recessed to' permit the free swing ofthe counterweight in, the open position of the bridge.

In witness whereof I have hereunto subscribed my name.

, SAMUEL 'MOREELL. 

